| D-ribitol-5-phoshate cytidylyltransferase | <enzyme> Catalyses reversibly the reaction of ctp and ribitol-5-phosphate to yield cdpribitol and pyrophosphate Registry number: EC 2.7.7.40 Synonym: cdpribitol pyrophosphorylase (26 Jun 1999) |
|---|---|
| D-ribose reductase | <enzyme> Ribose is converted to ribitol Registry number: EC 1.1.- (26 Jun 1999) |
| D-ribulokinase | <enzyme> Consider also EC 2.7.1.16 Registry number: EC 2.7.1.47 (26 Jun 1999) |
| D-S test | Examination of the patient's ability to respond to spondee words in the presence of a masking noise of the saw-tooth type; used especially in differentiating between functional and organic hearing loss. Synonym: D-S test. (05 Mar 2000) |
| D-selenocystine alpha, beta-lyase | <enzyme> From clostridium sticklandii; pyridoxal-p enzyme; mw 74kda; decomposes d-selenocystine into pyruvate, nh3 and elemental selenium; d-cystine, d-lanthionine, meso-lanthionine and d-cysteine can also serve as substrates; d-selenocysteine, d-serine, dl-selenohomocystine and l-amino acids are inert Registry number: EC 4.99.- Synonym: dsc-ab-lyase (26 Jun 1999) |
| D-serine dehydratase | <enzyme> Do not confuse with l-serine dehydratase (mh) Chemical name: d-serine hydro-lyase (deaminating) Registry number: EC 4.2.1.14 Synonym: d-serine deaminase (26 Jun 1999) |
| d-shaped plasma | <radiobiology> A toroidal plasma whose cross-section (poloidal plane) is a D (instead of a circle). A D-shape has a higher beta limit than a circular shape. (09 Oct 1997) |
| d-sorbitol-6-phosphate dehydrogenase | An oxidoreductase that catalyses the interconversion of d-sorbitol 6-phosphate and NAD+ to d-fructose 6-phosphate and NADH. A key step in fructose metabolism in the lens. Synonym: ketose reductase. (05 Mar 2000) |
| D-xylo-aldonate dehydratase | <enzyme> Forms 2-keto-3-deoxy-d-xylonate (d-pentulosonic acid) Registry number: EC 4.2.1.- Synonym: d-xylonate dehydratase (26 Jun 1999) |
| d-xylose absorption | This test measures the intestine's ability to absorb the simple sugar, D-xylose. This is an indicator for whether or not nutrients are being absorbed properly in the intestine. This test is often used to evaluate persistent diarrhoea, weight loss, malnutrition and cases of suspected malabsorption. Abnormal results may be seen in the following conditions: Crohn's disease, Giardiasis, hookworm infestation, radiation enteritis, celiac sprue, viral gastroenteritis and Whipple's disease. (27 Sep 1997) |
| D-xylulose reductase | <enzyme> Chemical name: xylitol nad 2-oxidoreductase (d-xylulose-forming) Registry number: EC 1.1.1.9 Synonym: xylitol dehydrogenase (26 Jun 1999) |